Partial clustering prevents global crystallization in a binary 2D colloidal glass former

Details Partial clustering prevents global crystallization in a binary 2D colloidal glass former Partial clustering prevents global crystallization in a binary 2D colloidal glass former

2009-03-16

arxiv.org/abs/0903.2812v4

The European Physical Journal E: Soft Matter and Biological Physics Volume 29, Number 3, 311-318, (2009)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1140/epje/i2009-10490-x

A mixture of two types of super-paramagnetic colloidal particles with long range dipolar interaction is confined by gravity to a flat interface of a hanging water droplet. The particles are observed by video microscopy and the dipolar interaction strength is controlled via an external magnetic field. The system is a model system to study the glass transition in 2D, and it exhibits partial clustering of the small particles. This clustering is strongly dependent on the relative concentration $\xi$ of big and small particles. However, changing the interaction strength $\Gamma$ reveals that the clustering does not depend on the interaction strength. The partial clustering scenario is quantified using Minkowski functionals and partial structure factors. Evidence that partial clustering prevents global crystallization is discussed.

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